Don't panic on unrecognised sum variant tag

2 files changed, 20 insertions, 16 deletions

diff --git a/examples/14-transient-0/output/rust/src/gen/data/transient_0.rs b/examples/14-transient-0/output/rust/src/gen/data/transient_0.rs
index 3f81215..f802163 100644
--- a/examples/14-transient-0/output/rust/src/gen/data/transient_0.rs
+++ b/examples/14-transient-0/output/rust/src/gen/data/transient_0.rs
@@ -206,7 +206,7 @@ pub fn decode_sum_with_variants(reader: &mut impl std::io::Read, shared_values:
     ::std::io::Result::Ok(match &crate::transient_0::decode_int_32(reader, shared_values)? {
         0 => crate::data::SumWithVariants::VariantOne(crate::data::transient_0::decode_variant_one(reader, shared_values)?),
         1 => crate::data::SumWithVariants::VariantTwo(crate::data::transient_0::decode_variant_two(reader, shared_values)?),
-        _ => todo!(),
+        _ => ::std::result::Result::Err(::std::io::Error::new(::std::io::ErrorKind::InvalidData, "unrecognised variant tag for data.SumWithVariants"))?,
     })
 }
 
@@ -248,7 +248,7 @@ pub fn decode_sum_with_boxed_variants(reader: &mut impl std::io::Read, shared_va
     ::std::io::Result::Ok(match &crate::transient_0::decode_int_32(reader, shared_values)? {
         0 => crate::data::SumWithBoxedVariants::VariantOne(::std::boxed::Box::new(crate::data::transient_0::decode_variant_one(reader, shared_values)?)),
         1 => crate::data::SumWithBoxedVariants::VariantTwo(::std::boxed::Box::new(crate::data::transient_0::decode_variant_two(reader, shared_values)?)),
-        _ => todo!(),
+        _ => ::std::result::Result::Err(::std::io::Error::new(::std::io::ErrorKind::InvalidData, "unrecognised variant tag for data.SumWithBoxedVariants"))?,
     })
 }
 
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java
index fed710f..b70752e 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java
@@ -379,19 +379,7 @@ public class RustTransient0Generator implements Generator {
 
         decodeMatchArms.add(new RustMatchArm(
             new RustWildcardPattern(),
-            new RustTryPropagationExpression(new RustCallExpression(
-                RustTypes.RESULT_ERR,
-                List.of(
-                    new RustCallExpression(
-                        RustTypes.IO_ERROR.addSegment(RustPathSegment.of("new")),
-                        List.of(
-                            RustTypes.IO_ERROR_KIND_INVALID_DATA,
-                            // TODO: include variant tag
-                            new RustStringLiteral("unrecognised variant tag for " + enumDefinition.type().describe())
-                        )
-                    )
-                )
-            ))
+            new RustTryPropagationExpression(generateUnrecognisedVariantResult(enumDefinition.type()))
         ));
 
         return generateDecodeFunction(
@@ -512,7 +500,7 @@ public class RustTransient0Generator implements Generator {
 
         decodeMatchArms.add(new RustMatchArm(
             new RustWildcardPattern(),
-            generateTodo()
+            new RustTryPropagationExpression(generateUnrecognisedVariantResult(sumDefinition.type()))
         ));
 
         return generateDecodeFunction(
@@ -1104,6 +1092,22 @@ public class RustTransient0Generator implements Generator {
         );
     }
 
+    private static RustCallExpression generateUnrecognisedVariantResult(Type type) {
+        return new RustCallExpression(
+            RustTypes.RESULT_ERR,
+            List.of(
+                new RustCallExpression(
+                    RustTypes.IO_ERROR.addSegment(RustPathSegment.of("new")),
+                    List.of(
+                        RustTypes.IO_ERROR_KIND_INVALID_DATA,
+                        // TODO: include variant tag
+                        new RustStringLiteral("unrecognised variant tag for " + type.describe())
+                    )
+                )
+            )
+        );
+    }
+
     private RustExpression tryIntoOrInvalidData(RustExpression value) {
         return new RustTryPropagationExpression(mapErrToInvalidData(
             methodCall(